As people are talking about his appearances/goals, I thought I'd do a little comparison of Lucas against the other CMs we've had recently. I've also included stats from the start of Gerrard's career, just for comparison.
Lucas has so far made 134 appearances, and scored 6 goals
In his first 3 seasons with us, Alonso made 136 appearances, and scored 12 goals
In his first four seasons with us, Gerrard made 139 appearances, and scored 15 goals
Mascherano made 139 appearances and scored 2 goals
Sissoko made 87 appearances, and scored 1 goal
So Lucas's scoring rate isn't that bad really. Especially when you take into account how many of those appearances were as a substitute:
Lucas 97 starts, 37 sub
Alonso 117 starts, 19 sub
Gerrard 119 starts, 20 sub
Mascherano 132 starts, 7 sub
Sissoko 72 starts, 15 sub